package edu.hunan.cxb18.dao;

/**
 * @author chenheng
 * @create 2020-03-26 8:20
 */
public interface AccountDao {
    /**
     * 根据用户名查询专户余额
     * @param username
     * @return
     */
    double queryBalance(String username);

    void updateBalance(String username,double amount);
}
